core: update database path test to verify correct channel-based filename

The test now validates that the database file is named according to the current installation channel (latest/beta get 'opencode.db', others get sanitized names). This ensures users' data is stored in the correct location based on their update channel.

packages/opencode/test/storage/db.test.ts

@@ -1,12 +1,14 @@
 import { describe, expect, test } from "bun:test"
+import path from "path"
+import { Installation } from "../../src/installation"
 import { Database } from "../../src/storage/db"
 
-describe("Database.file", () => {
-  test("uses the shared database for latest", () => {
-    expect(Database.file("latest")).toBe("opencode.db")
-  })
-
-  test("sanitizes preview channels for filenames", () => {
-    expect(Database.file("fix/windows-modified-files-tracking")).toBe("opencode-fix-windows-modified-files-tracking.db")
+describe("Database.Path", () => {
+  test("returns database path for the current channel", () => {
+    const file = path.basename(Database.Path)
+    const expected = ["latest", "beta"].includes(Installation.CHANNEL)
+      ? "opencode.db"
+      : `opencode-${Installation.CHANNEL.replace(/[^a-zA-Z0-9._-]/g, "-")}.db`
+    expect(file).toBe(expected)
   })
 })